| Brand | Unbranded |
|---|---|
| UPC | 7452320982222 |
Check the listing for details. ♡ AM Radio Transmitter Board Short Wave Low Power Sound Amplification SW Radio. Condition: New. Listed at 33.89 USD. High Frequency Oscillation: 21MHZ high frequency oscillation, crystal Y1 in the circuit is a parallel resonance, equivalent to the inductor. Structure: Mainly consists of power input, sound amplification, sound modulation, 21MHZ high frequency oscillation, Class C high frequency amplification, 21MHZ low pass filter.